Allowance for Loan Losses - Allowance for Loan Losses and the Recorded Investment in Loans by Portfolio Segment (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Apr. 01, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Total ending allowance balance	$ 15,660	$ 16,102	$ 15,992	$ 18,880	$ 19,565	$ 18,270
Total ending loans balance	7,715			9,427
Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment	1,135		1,312
Allowance For Loan Losses, Collectively evaluated for impairment	14,031		14,291
Loans acquired with deteriorated credit quality	(494)		(389)
Total ending allowance balance	15,660		15,992
Commercial [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment	1,135		1,312
Allowance For Loan Losses, Collectively evaluated for impairment	5,329		4,963
Loans acquired with deteriorated credit quality	(494)		(389)
Total ending allowance balance	6,958		6,664
Real Estate [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment
Allowance For Loan Losses, Collectively evaluated for impairment	2,367		3,462
Loans acquired with deteriorated credit quality
Total ending allowance balance	2,367		3,462
Consumer [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment
Allowance For Loan Losses, Collectively evaluated for impairment	4,776		4,228
Loans acquired with deteriorated credit quality
Total ending allowance balance	4,776		4,228
Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment	7,715		7,448
Loans: Collectively evaluated for impairment	1,317,110		1,054,157
Loans acquired with deteriorated credit quality	591		10,409
Total ending loans balance	1,325,416		1,072,014
Loans [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment	7,715		7,448
Loans: Collectively evaluated for impairment	641,485		489,547
Loans acquired with deteriorated credit quality	591		9,355
Total ending loans balance	649,791		506,350
Loans [Member] | Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment
Loans: Collectively evaluated for impairment	236,412		186,526
Loans acquired with deteriorated credit quality			24
Total ending loans balance	236,412		186,550
Loans [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment
Loans: Collectively evaluated for impairment	297,837		279,448
Loans acquired with deteriorated credit quality			1,030
Total ending loans balance	297,837		280,478
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance For Loan Losses, Individually evaluated for impairment
Allowance For Loan Losses, Collectively evaluated for impairment	1,559		1,638
Loans acquired with deteriorated credit quality
Total ending allowance balance	1,559		1,638
Mortgage Warehousing [Member] | Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans: Individually evaluated for impairment
Loans: Collectively evaluated for impairment	141,376		98,636
Loans acquired with deteriorated credit quality
Total ending loans balance	$ 141,376		$ 98,636